Measuring Examples

7 - 9

MEASURING THREE-PHASE ON A DUAL INPUT

Dual input measurements can be used for many applica- tions. This example shows how to use these measure- ments to determine phase rotation of a "Y" connected three-phase system at a load center. Use alligator clips to connect the ScopeMeter test tool to the three-phase sys- tem connections.

Figure 7-8. Testing a Three-Phase System

WARNING

THE SETUP REQUIRES CONNECTING TEST LEADS TO LIVE COMPONENTS OF A HIGH ENERGY CIRCUIT. TO AVOID ELECTRIC SHOCK AND/OR EQUIPMENT DAMAGE, USE CAUTION WHEN CONNECTING ALLI- GATOR CLIPS TO LIVE COMPONENTS.

THE METAL JAWS OF ALLIGATOR CLIPS CAN CRE- ATE A SHORT CIRCUIT BETWEEN CLOSELY SPACED LIVE PARTS. AVOID MAKING CONNECTIONS TO FEEDER CONDUCTORS OR BUS BARS AT ELEVATED POTENTIALS. WHENEVER POSSIBLE, MAKE CON- NECTIONS TO THE OUTPUT SIDE OF A CIRCUIT BREAKER WHICH CAN PROVIDE BETTER SHORT CIRCUIT PROTECTION.

MAKE CONNECTIONS TO CIRCUIT BREAKERS BY FIRST TURNING THE CIRCUIT BREAKER OFF. THEN CONNECT THE ALLIGATOR CLIP TO THE BREAKER OUTPUT TERMINAL VIA A SHORT PIECE OF INSU- LATED WIRE AS SHOWN IN FIGURE 7-9.

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Fluke 105B, 99B manual Measuring THREE-PHASE on a Dual Input, Testing a Three-Phase System

99B, 105B specifications

The Fluke 105B and Fluke 99B are highly regarded oscilloscopes that offer a blend of performance, portability, and user-friendly features, making them ideal tools for both professionals and enthusiasts in the electronics field. These oscilloscopes exemplify Fluke's commitment to quality and precision in electrical testing and diagnostics.

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